That's the world out there, little green apples and infectious disease.

He grinned. It was the sort of grin that Agnes supposed was called infectious but, then, so was measles.

They all call me 'Excuse me,' even though my nametag clearly says 'Jordan.' It's like people don't actually exist while they're working. Workers are just tools who aren't supposed to have feelings or personalities. You don't become human until your shift is over. Until then, we're all just zombies. We're dead to the world: infected people who need to be avoided, unless, of course, someone needs to know where the paintbrushes are located.

Humanity shares a common ancestry with all living things on Earth. We often share especially close intimacies with the microbial world. In fact, only a small percentage of the cells in the human body are human at all. Yet, the common biology and biochemistry that unites us also makes us susceptible to contracting and transmitting infectious disease.

In times of stress and danger such as come about as the result of an epidemic, many tragic and cruel phases of human nature are brought out, as well as many brave and unselfish ones.